If yes, you can switch to the front and click to enter the professional version of the light blue China Merchants Bank page, and there will be a prompt box to confirm the payment.

I've met it, too. A prompt box pops up, and you can press OK.

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I don't know about that. I use a digital certificate. See if there is a network problem that prevents online banking from responding to the server. You'd better call customer service to ask, after all, they know better.